> > 3.1 Compressed files cannot be differenced
>
> I recall seeing some work done to determine how much savings you could
> expect if you used xdeltas of the uncompressed data. This would be the
> best result you could expect from gzip --rsyncable. I recall the numbers
> were disapointing, it was << 50% on average or somesuch. It would be nice
> if someone could find that email or repeat the experiments.
>
With the help of an admin from an rsync server I tested the download of
a with "gzip --rsyncable" compressed Packages.gz versus an uncompressed
Packages. The results are under
"http://lists.debian.org/debian-devel/2001/debian-devel-200106/msg01859.
html"
It just shows 2 days but the test went on for about a week with similar
results. While uncompressed is still the best for rsync download, it
shows a significant reduction (more than 50%) against a normal
compressed Packages.gz. Similar savings are possible if this is applied
to Debian packages.
O. Wyss
--
Author of "Debian partial mirror synch script"
("http://dpartialmirror.sourceforge.net/&quot;)
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